Class

non-silicate mineral

Compound type

sulfate

Chemical functions

	Function	Number	Relevance
	$(SO_4)^{2-}$	2
	$R-OH$	2	main

Chemical bonds

	Bond	Number	Relevance
	$-O-H$	2	main
	$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$	4

Oxides

Formula	$Na_{2}O$	$MgO$	$H_{2}O$	$SO_{3}$
Mass fraction (%)	18.53	12.05	21.54	47.87

Strunz

Class

sulfates - chromates - molybdates - tungstates (07)

Division

sulfates (selenates, etc.) without additional anions, with H2O (07.C)

Family

with medium-sized and large cations (07.CC)

Code

07.CC.50

Dana

Major class

sulfates, chromates, selenates (VI)

Class

hydrated acid and sulfates (29)

Type

where (A+)2B(XO4)2.x(H2O) (29.03)

Group

Blodite group (29.03.03)

Code

29.03.03.01

Phase type

crystalline

Crystal system

monoclinic

Crystal class

prismatic

Crystal class symbol

2/m (C2h)

Crystal spacegroup

P2(1)/c

Molar mass

334.47 $g/mol$

Density

2.23 $g/cm^3$

Refringence type

biaxial

Refringence sign

negative

Birefringence

0.004

Refraction index $n_{\alpha}$

1.483

Refraction index $n_{\beta}$

1.486

Refraction index $n_{\gamma}$

1.487

Dispersion V

relatively strong

Color

colorless, green, yellow, red

Diaphaneity

transparent to translucent